/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hadoop.hive.ql.ddl.table.partition.set;

import org.apache.hadoop.hive.common.TableName;
import org.apache.hadoop.hive.metastore.api.hive_metastoreConstants;
import org.apache.hadoop.hive.ql.QueryState;
import org.apache.hadoop.hive.ql.ddl.DDLSemanticAnalyzerFactory.DDLType;
import org.apache.hadoop.hive.ql.ddl.DDLWork;
import org.apache.hadoop.hive.ql.ddl.table.AbstractAlterTableAnalyzer;
import org.apache.hadoop.hive.ql.ddl.table.AlterTableType;
import org.apache.hadoop.hive.ql.exec.TaskFactory;
import org.apache.hadoop.hive.ql.hooks.ReadEntity;
import org.apache.hadoop.hive.ql.metadata.Table;
import org.apache.hadoop.hive.ql.parse.ASTNode;
import org.apache.hadoop.hive.ql.parse.HiveParser;
import org.apache.hadoop.hive.ql.parse.PartitionTransform;
import org.apache.hadoop.hive.ql.parse.TransformSpec;
import org.apache.hadoop.hive.ql.parse.SemanticException;
import org.apache.hadoop.hive.ql.session.SessionStateUtil;

import java.util.List;
import java.util.Map;

/**
 * Analyzer for set partition spec commands.
 */
@DDLType(types = HiveParser.TOK_ALTERTABLE_SETPARTSPEC)
public class AlterTableSetPartitionSpecAnalyzer extends AbstractAlterTableAnalyzer {

  public AlterTableSetPartitionSpecAnalyzer(QueryState queryState) throws SemanticException {
    super(queryState);
  }

  @Override
  protected void analyzeCommand(TableName tableName, Map<String, String> partitionSpec, ASTNode command)
      throws SemanticException {
    Table table = getTable(tableName);
    validateAlterTableType(table, AlterTableType.SETPARTITIONSPEC, false);
    inputs.add(new ReadEntity(table));
    List<TransformSpec> partitionTransformSpec =
        PartitionTransform.getPartitionTransformSpec(command);
    if (!SessionStateUtil.addResource(conf, hive_metastoreConstants.PARTITION_TRANSFORM_SPEC,
        partitionTransformSpec)) {
      throw new SemanticException("Query state attached to Session state must be not null. " +
          "Partition transform metadata cannot be saved.");
    }

    AlterTableSetPartitionSpecDesc desc = new AlterTableSetPartitionSpecDesc(tableName, partitionSpec);

    rootTasks.add(TaskFactory.get(new DDLWork(getInputs(), getOutputs(), desc)));
  }


}
